<template>
  <div>
    <div class="user-info-head" @click="editCropper()">
      <img style="height: 150px;width: 150px" v-bind:src="option.img" title="点击上传头像" class="img-circle img-lg"/>
    </div>
    <el-dialog :title="title" :visible.sync="open" width="800px" append-to-body @opened="modalOpened"
               @close="closeDialog()">
      <div class="cropper-content">
        <div class="cropper-box">
          <div class="cropper">
            <vue-cropper
              ref="cropper"
              :img="option.img"
              :outputSize="option.outputSize"
              :outputType="option.outputType"
              :info="option.info"
              :canScale="option.canScale"
              :autoCrop="option.autoCrop"
              :autoCropWidth="option.autoCropWidth"
              :autoCropHeight="option.autoCropHeight"
              :fixed="option.fixed"
              :fixedNumber="option.fixedNumber"
              :full="option.full"
              :fixedBox="option.fixedBox"
              :canMove="option.canMove"
              :canMoveBox="option.canMoveBox"
              :original="option.original"
              :centerBox="option.centerBox"
              :height="option.height"
              :infoTrue="option.infoTrue"
              :maxImgSize="option.maxImgSize"
              :enlarge="option.enlarge"
              :mode="option.mode"
              @realTime="realTime">
            </vue-cropper>
          </div>
          <!--底部操作工具按钮-->
          <div class="footer-btn">
            <div class="scope-btn">
              <label class="btn" for="uploads">选择封面</label>
              <input type="file" id="uploads" style="position:absolute; clip:rect(0 0 0 0);" accept="image/png, image/jpeg, image/gif, image/jpg" @change="selectImg($event)">
              <el-button size="mini" type="danger" plain icon="el-icon-zoom-in" @click="changeScale(1)">放大</el-button>
              <el-button size="mini" type="danger" plain icon="el-icon-zoom-out" @click="changeScale(-1)">缩小</el-button>
              <el-button size="mini" type="danger" plain @click="rotateLeft">↺ 左旋转</el-button>
              <el-button size="mini" type="danger" plain @click="rotateRight">↻ 右旋转</el-button>
            </div>
            <div class="upload-btn">
              <el-button size="mini" type="success" @click="uploadImg('blob')">上传封面 <i class="el-icon-upload"></i></el-button>
            </div>
          </div>
        </div>
        <!--预览效果图-->
        <div class="show-preview">
          <div :style="previews.div" class="preview">
            <img :src="previews.url" :style="previews.img">
          </div>
        </div>
      </div>
    </el-dialog>
  </div>
</template>

<script>
  import store from '@/store'
  import { VueCropper } from 'vue-cropper'
  import { updateUserAvatar } from '@/api/user'

  export default {
    components: { VueCropper },
    props: {
      user: {
        type: Object
      }
    },
    data() {
      return {
        // 是否显示弹出层
        open: false,
        // 是否显示cropper
        visible: false,
        // 弹出层标题
        title: '修改头像',
        option:{
          img: '',             //裁剪图片的地址
          outputSize: 1,       //裁剪生成图片的质量(可选0.1 - 1)
          outputType: 'jpeg',  //裁剪生成图片的格式（jpeg || png || webp）
          info: true,          //图片大小信息
          canScale: true,      //图片是否允许滚轮缩放
          autoCrop: true,      //是否默认生成截图框
          autoCropWidth: 200,  //默认生成截图框宽度
          autoCropHeight: 200, //默认生成截图框高度
          fixed: true,         //是否开启截图框宽高固定比例
          fixedNumber: [1, 1], //截图框的宽高比例
          full: false,         //false按原比例裁切图片，不失真
          fixedBox: true,      //固定截图框大小，不允许改变
          canMove: true,      //上传图片是否可以移动
          canMoveBox: true,    //截图框能否拖动
          original: false,     //上传图片按照原始比例渲染
          centerBox: false,    //截图框是否被限制在图片里面
          height: true,        //是否按照设备的dpr 输出等比例图片
          infoTrue: false,     //true为展示真实输出图片宽高，false展示看到的截图框宽高
          maxImgSize: 3000,    //限制图片最大宽度和高度
          enlarge: 1,          //图片根据截图框输出比例倍数
          mode: '200px 200px'  //图片默认渲染方式
        },
        previews: {}
      }
    },
    created() {
      //this.option.img = this.$store.getters.avatar;
      //可以解决Vue-Cropper跨域的问题
      this.setAvatarBase64(this.$store.getters.avatar, (base64) => {
        this.option.img = base64;
      })
    },
    methods: {
      // 设置头像base64
      setAvatarBase64(src, callback) {
        let _this = this;
        let image = new Image();
        // 处理缓存
        image.src = src + '?v=' + Math.random();
        // 支持跨域图片
        image.crossOrigin = "*";
        image.onload = function () {
          let base64 = _this.transBase64FromImage(image);
          callback && callback(base64);
        }
      },
      // 将网络图片转换成base64格式
      transBase64FromImage(image) {
        let canvas = document.createElement("canvas");
        canvas.width = image.width;
        canvas.height = image.height;
        let ctx = canvas.getContext("2d");
        ctx.drawImage(image, 0, 0, image.width, image.height);
        // 可选其他值 image/jpeg
        return canvas.toDataURL("image/png");
      },
      // 编辑头像
      editCropper() {
        this.open = true
      },
      // 打开弹出层结束时的回调
      modalOpened() {
        this.visible = true
      },
      // 覆盖默认的上传行为
      requestUpload() {
      },
      // 向左旋转
      rotateLeft() {
        this.$refs.cropper.rotateLeft()
      },
      // 向右旋转
      rotateRight() {
        this.$refs.cropper.rotateRight()
      },
      // 图片缩放
      changeScale(num) {
        num = num || 1
        this.$refs.cropper.changeScale(num)
      },
      selectImg (e) {
        let file = e.target.files[0]
        if (!/\.(jpg|jpeg|png|JPG|PNG)$/.test(e.target.value)) {
          this.$message({
            message: '图片类型要求：jpeg、jpg、png',
            type: "error"
          });
          return false
        }
        //转化为blob
        let reader = new FileReader()
        reader.onload = (e) => {
          let data
          if (typeof e.target.result === 'object') {
            data = window.URL.createObjectURL(new Blob([e.target.result]))
          } else {
            data = e.target.result
          }
          this.option.img = data
        }
        //转化为base64
        reader.readAsDataURL(file)
      },
      //上传图片
      uploadImg (type) {
        if (type === 'blob') {
          //获取截图的blob数据
          this.$refs.cropper.getCropBlob(async (data) => {
            let formData = new FormData();
            formData.append('file',data,"DX.jpg")
            //调用axios上传
            updateUserAvatar(formData).then(res=>{
              if (res.flag){
                this.$message.success("更新成功")
                this.$store.dispatch("user/getInfo").then(res=>{
                  this.setAvatarBase64(this.$store.getters.avatar,(base64)=>{
                    this.option.img = base64
                  })
                });
              }else{
                this.$message.success("更新失败")
              }
            }).catch(err=>{console.info(err)})
          })
        }
      },
      // 实时预览
      realTime(data) {
        this.previews = data
      },
      // 关闭窗口
      closeDialog() {
        this.visible = false
      }
    }
  }
</script>
<style scoped lang="scss">
  .user-info-head {
    position: relative;
    display: inline-block;
    height: 150px;
  }

  .user-info-head:hover:after {
    content: '+';
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    color: #eee;
    background: rgba(0, 0, 0, 0.5);
    font-size: 50px;
    font-style: normal;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    cursor: pointer;
    line-height: 150px;
    border-radius: 50%;
  }

  .cropper-content{
    display: flex;
    display: -webkit-flex;
    justify-content: flex-end;
    .cropper-box{
      flex: 1;
      width: 100%;
      .cropper{
        width: auto;
        height: 300px;
      }
    }

    .show-preview{
      flex: 1;
      -webkit-flex: 1;
      display: flex;
      display: -webkit-flex;
      justify-content: center;
      .preview{
        overflow: hidden;
        border:1px solid #67c23a;
        background: #cccccc;
      }
    }
  }
  .footer-btn{
    margin-top: 30px;
    display: flex;
    display: -webkit-flex;
    justify-content: flex-end;
    .scope-btn{
      display: flex;
      display: -webkit-flex;
      justify-content: space-between;
      padding-right: 10px;
    }
    .upload-btn{
      flex: 1;
      -webkit-flex: 1;
      display: flex;
      display: -webkit-flex;
      justify-content: center;
    }
    .btn {
      outline: none;
      display: inline-block;
      line-height: 1;
      white-space: nowrap;
      cursor: pointer;
      -webkit-appearance: none;
      text-align: center;
      -webkit-box-sizing: border-box;
      box-sizing: border-box;
      outline: 0;
      -webkit-transition: .1s;
      transition: .1s;
      font-weight: 500;
      padding: 8px 15px;
      font-size: 12px;
      border-radius: 3px;
      color: #fff;
      background-color: #409EFF;
      border-color: #409EFF;
      margin-right: 10px;
    }
  }

</style>
